ESP32 Dev Board

Official Espressif documentation:

The ESP32 is a dual-core 240MHz microcontroller with built-in WiFi and Bluetooth. The 38-pin dev board breaks all GPIO pins out on two rows of headers.

For SPI displays like the GC9A01, the ESP32 uses its hardware SPI peripheral on GPIO 18 (SCLK) and GPIO 23 (MOSI). DC, CS, and RST are standard GPIO and can be reassigned if needed.